A punched 1/4" hole is perfect to feed the HID wire through the bulb cap. It takes some effort & silicone grease, but the rubber will stretch enough for the connectors to pass through. The clean hole forms a better seal around the cable than a slit would.

With separate High & Low bulbs, the lows CAN be wired to stay on with the highs; with HID, the lows SHOULD be wired to stay on. A simple jumper across the dimmer switch (from input to low) will do that.

UPDATE: one of these ballasts burned out, and the seller didn't respond to my e-mail about a replacement. So I've removed the other ballast, and I'll just run halogens.

Owner caption December 2012 · Photo 4862 of 5000